bigmatt said:
...There are ways to tell. First and easiest would be to check to see if any parts were charged out.
Except for the most obvious things like the HAMMER or TRIGGER, there's not much to see, unless you're very familiar with CZs. Just polishing the action (trigger bar, sear and hammer hooks, the firing pin safety plunger, and polishing where any of these parts rub each other will do wonders. Lightening the hammer spring a pound or two will lighten and improve the trigger if you want a
lighter trigger. One gunsmith I knew (now retired) polished the
inside of the hammer spring and recoil spring with a
very fine needle file, and also polished the surface of the hammer strut with wet/dry sandpaper. None of these modifications would be easily seen unless you detail-stripped and knew where to look -- but all of them could be felt when you worked the action or pulled the trigger.
bigmatt said:
Are the trigger and firing pin retaining pin standard roll pins? (Double roll pin for FP retaining pin).
Is CZ using roll pins for the trigger? (They always used staked solid pins in the past. (I haven't bought a new one in a while.) My P-07 Duty -- which I like a lot -- has a solid trigger pin, so I assumed the old practice was still in place. Doubled roll pins have been around for several years, but there are still a lot of used CZs out there, many with action work done, that still have single roll pins' a few may have been upgraded by their owners.
bigmatt said:
Even if it HAD work done it can be made better.
Smoother and crisper is always better, but a lighter trigger is a matter of personal taste. Some of the purists who shoot competitively feel that the firing pin block safety has to go, and that, in turn, requires some timing adjustments (which are above my pay grade). But most argue against that sort of change -- and very light triggers -- in a CARRY or Home Defense semi-auto.